Whats going on here??

[CountryBoy]

My 2 convicts are acting weird. they look fine and all tests are ok.
They are swimming around with their heads higher then their tails. Almost vertical but not quite. I have never noticed this before and I havent changed anything with them. What could be wrong and should I be worried?

Ammonia - 0
Nitrites - 0
Nitrates - 10

 

[big54bob]

try a water change. those nitrates sound allitle high.

 

[CountryBoy]

No they are good. below 20 is non toxic so I dont believe thats my problem. I did a water change earlier today. Im going to test the water again in the morning.

 

[TabMorte]

Are they swimming closer to the surface then normal?
Any color change or signs of distress?

 

[CountryBoy]

No they are at all depths of the tank and their color looks good. Like I said nothing has changed but the way they are swimming. I did a water change yesterday and I tested the water again this morning and all tests were good again. I am stumped. They are eating good also..